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The Sisters were the personal coven of Witches for the Strix. They consisted of stray witches without a proper Coven or family who joined the Strix as magic consultants providing them spells and predictions. According to Aya, the former de facto leader of the Strix, the Sisters possess great skill in Witchcraft, specifically Dark Magic; this was shown by Ariane, a powerful seer, and Madison, a witch capable of incapacitating powerful individuals such as Klaus.